KINETICS ANALYSIS OF HIGHER TEMPERATURE SALT BATH NITRIDING FOR AISI 1045 STEEL

Mingyang Dai, Yao Chen, Yating Chai and Jing Hu
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Mingyang Dai: School of Materials Science and Engineering, Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China
Yao Chen: School of Materials Science and Engineering, Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China
Yating Chai: #x2020;Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, China‡Materials Research and Education Center, Auburn University, AL36849, USA
Jing Hu: School of Materials Science and Engineering, Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China†Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, China‡Materials Research and Education Center, Auburn University, AL36849, USA

Surface Review and Letters (SRL), 2016, vol. 23, issue 06, 1-5

Abstract: Rapid salt bath nitriding was conducted at higher temperature above 600∘C instead of normally used 560∘C for AISI 1045 steel. Optical microscopy (OM), X-ray diffraction (XRD) and micro-hardness tester were employed to characterize the microstructure, phase constituents and micro-hardness of the treated specimens. The results showed that salt bath nitriding at higher temperature could significantly increase the compound layer thickness and higher cross-sectional hardness can be obtained. Kinetics analysis illustrated that the nitrogen atoms diffusion coefficient was obviously increased with temperature, and the activation energy of nitrogen atom diffusion was decreased from 220kJ⋅mol−1 to 142kJ⋅mol−1.

Keywords: Salt bath nitriding; XRD; hardness; kinetics (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1142/S0218625X16500499

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